US7463070B2 - Switching device for driving LED array by pulse-shaped current modulation - Google Patents

Switching device for driving LED array by pulse-shaped current modulation Download PDF

Info

Publication number
US7463070B2
US7463070B2 US10/504,139 US50413904A US7463070B2 US 7463070 B2 US7463070 B2 US 7463070B2 US 50413904 A US50413904 A US 50413904A US 7463070 B2 US7463070 B2 US 7463070B2
Authority
US
United States
Prior art keywords
pulse
led array
modulation
switching device
shaped current
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime, expires
Application number
US10/504,139
Other versions
US20050088209A1 (en
Inventor
Johannes Hendrik Wessels
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Signify Holding BV
Original Assignee
Koninklijke Philips Electronics NV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Koninklijke Philips Electronics NV filed Critical Koninklijke Philips Electronics NV
Publication of US20050088209A1 publication Critical patent/US20050088209A1/en
Priority to US12/265,354 priority Critical patent/US20090072761A1/en
Application granted granted Critical
Publication of US7463070B2 publication Critical patent/US7463070B2/en
Assigned to KONINKLIJKE PHILIPS N.V. reassignment KONINKLIJKE PHILIPS N.V. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: KONINKLIJKE PHILIPS ELECTRONICS N.V.
Assigned to PHILIPS LIGHTING HOLDING B.V. reassignment PHILIPS LIGHTING HOLDING B.V. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KONINKLIJKE PHILIPS N.V.
Assigned to SIGNIFY HOLDING B.V. reassignment SIGNIFY HOLDING B.V. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: PHILIPS LIGHTING HOLDING B.V.
Adjusted expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/10—Controlling the intensity of the light
    • H05B45/14—Controlling the intensity of the light using electrical feedback from LEDs or from LED modules
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/32—Pulse-control circuits
    • H05B45/325—Pulse-width modulation [PWM]
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/04—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions
    • G09G3/06—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions using controlled light sources
    • G09G3/12—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions using controlled light sources using electroluminescent elements
    • G09G3/14—Semiconductor devices, e.g. diodes
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/305—Frequency-control circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/32—Pulse-control circuits
    • H05B45/33—Pulse-amplitude modulation [PAM]
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/32—Pulse-control circuits
    • H05B45/335—Pulse-frequency modulation [PFM]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Definitions

  • the invention relates to a switching device for driving a LED array.
  • WO 0020691 has disclosed a LED array serving as road marking.
  • the brightness of the relevant road marking as perceived by the traffic participant is considerably influenced by the local circumstances such as, for example, the time of day and prevailing weather conditions.
  • the perceived brightness is to be sufficiently great for a proper observance of the marking and, on the other hand, this brightness should remain limited to avoid a traffic participant's attention being distracted too much from other observations which are of importance for safe traffic handling, or to avoid dazzling.
  • a switching device for driving a LED array comprises means for driving a LED array with a pulse-shaped current of mean strength and for regulating the mean strength of the current flowing through the LED array by means of at least one of the following types of modulation: frequency modulation, pulse-width modulation, and amplitude modulation of the pulse-shaped current. Regulation is preferably effected with a combination of two types of modulation of the pulse-shaped current.
  • pulse-shaped current regulation is highly advantageous because pulse-shaped regulation can be realized by modern electronic power supply circuits in a relatively simple way.
  • an extraordinarily wide control range for the mean current strength is realized.
  • the brightness of the marking formed by the LED array can be adapted well to the locally prevailing circumstances, which circumstances may be subject to major changes.
  • the control range may be advantageously increased by a combination of the three types of modulation.
  • a suitable form of controlling the brightness through regulation of the average or mean current (having a strength or level referred to as Inom) flowing through the LED array is based on a regulation by means of pulse-width modulation for a current strength in a range between the mean nominal current level Inom and 0.05 Inom, with amplitude modulation superimposed thereon so as to regulate the mean current strength Inom in a range from 0.05 Inom to 0.05*10 ⁇ 3 Inom.
  • FIG. 1 a drawing of an embodiment of a switching device according to the invention illustrated in FIG. 1
  • FIG. 2 a drawing of a block diagram of a LED array illustrated in FIG. 2 .
  • the switching device as shown in FIG. 1 has an input JP 1 for connection to a supply source.
  • the general property of LEDs that there is only a small forward voltage across the LED in operating condition means that a low-voltage supply source may be used.
  • An output JP 2 is suitable for connecting the LED array to be operated, such as for example an LED array 10 shown in FIG. 2 consisting of two or more LEDS arranged in series and/or in parallel as known in the art.
  • a series combination of a LED D 2 and a resistor R 9 is connected in parallel to the output.
  • a semiconductor switching element Q 3 in parallel to the output and the series combination is present, a main electrode EQ 3 of which element is connected to a main electrode EQ 2 of a semiconductor switch Q 2 which is connected between input and output.
  • a control electrode GQ 2 of semiconductor switch Q 2 is connected to a control electrode GQ 3 of the semiconductor switching element Q 3 and to a shared control circuit.
  • the control electrodes GQ 2 and GQ 3 are connected to a center tap 2 of a potentiometer R 10 , which is connected in series with a transistor Q 1 .
  • the position of the center tap 2 of the potentiometer R 10 determines the degree of current conduction through the semiconductor switch Q 2 and the semiconductor switching element Q 3 .
  • potentiometer R 10 and transistor Q 1 constitutes an output of a pulse-width modulator formed around an opamp U 2 B.
  • An output 7 of opamp U 2 B is connected to a base of transistor Q 1 .
  • Input 5 of the opamp U 2 B is connected to a capacitor C 5 , which is part of an oscillator, and input 6 of opamp U 2 B is connected to a variable voltage divider R 7 , R 6 , R 5 .
  • the time per cycle of the oscillator frequency during which the signal at output 7 turns transistor Q 1 on or off respectively, can be varied by means of the variable voltage divider, so that the pulse width of the current pulse is varied by the semiconductor switch Q 2 .
  • Capacitor C 5 and opamp U 2 A form part of an oscillation circuit in which the capacitor C 5 together with impedances R 4 and R 12 constitutes a voltage divider circuit.
  • R 4 is herein an adjustable resistor, which achieves that the frequency generated by the oscillation circuit can be adjusted and can therefore be varied. In consequence, the current pulse frequency will vary accordingly.
  • the opamps U 2 A and U 2 B are constituted by a single integrated circuit (IC) of the type TS393CN.
  • Transistor Q 1 is of the type BC548C, semiconductor switch Q 2 of the type BC639, and semiconductor switching element Q 3 of the type BC640.
  • the oscillator circuit has a default frequency of 200 Hz.
  • Potentiometer R 10 has a strength of 4.7 k ⁇ and has a 100% control range.
  • the switching device is intended to be connected to a 15V DC supply source.
  • the switching device drives a LED array for road marking, which LED array comprises a total of 400 LEDs of the type Nichia NSPW300BS.
  • the supply is effected such that the mean current flowing through each LED of the array is 20 mA.
  • Brightness control down to a level corresponding to a mean current through each LED of 1 mA takes place exclusively by varying the voltage divider R 7 , R 6 , R 5 .
  • the pulse width is then modulated to a 2% duty cycle.
  • the setting of the potentiometer R 10 is varied. When the complete control range of the potentiometer R 10 is utilized, the mean current flowing through each LED can be reduced to 1 ⁇ A.

Abstract

A circuit drives an LED array and controls the brightness of the LED array by regulating the current flowing through the array. The LED array is driven by a pulse-shaped current of which the mean value is regulated with at least one or two of the following types of modulation: frequency modulation, pulse-width modulation, and amplitude modulation.

Description

The invention relates to a switching device for driving a LED array.
WO 0020691 has disclosed a LED array serving as road marking. The brightness of the relevant road marking as perceived by the traffic participant is considerably influenced by the local circumstances such as, for example, the time of day and prevailing weather conditions. On the one hand, the perceived brightness is to be sufficiently great for a proper observance of the marking and, on the other hand, this brightness should remain limited to avoid a traffic participant's attention being distracted too much from other observations which are of importance for safe traffic handling, or to avoid dazzling.
The invention provides a solution to the problem thus arisen. According to the invention, a switching device for driving a LED array is characterized in that the switching device comprises means for driving a LED array with a pulse-shaped current of mean strength and for regulating the mean strength of the current flowing through the LED array by means of at least one of the following types of modulation: frequency modulation, pulse-width modulation, and amplitude modulation of the pulse-shaped current. Regulation is preferably effected with a combination of two types of modulation of the pulse-shaped current.
Since light generation of a LED is dependent on the current strength through the LED, pulse-shaped current regulation is highly advantageous because pulse-shaped regulation can be realized by modern electronic power supply circuits in a relatively simple way. By combining at least two kinds of modulation of the current flowing through the LED, an extraordinarily wide control range for the mean current strength is realized. In consequence, the brightness of the marking formed by the LED array can be adapted well to the locally prevailing circumstances, which circumstances may be subject to major changes. The control range may be advantageously increased by a combination of the three types of modulation.
A suitable form of controlling the brightness through regulation of the average or mean current (having a strength or level referred to as Inom) flowing through the LED array is based on a regulation by means of pulse-width modulation for a current strength in a range between the mean nominal current level Inom and 0.05 Inom, with amplitude modulation superimposed thereon so as to regulate the mean current strength Inom in a range from 0.05 Inom to 0.05*10−3 Inom.
The invention will be further explained with reference to a drawing of an embodiment of a switching device according to the invention illustrated in FIG. 1, and a drawing of a block diagram of a LED array illustrated in FIG. 2.
The switching device as shown in FIG. 1 has an input JP1 for connection to a supply source. The general property of LEDs that there is only a small forward voltage across the LED in operating condition means that a low-voltage supply source may be used. An output JP2 is suitable for connecting the LED array to be operated, such as for example an LED array 10 shown in FIG. 2 consisting of two or more LEDS arranged in series and/or in parallel as known in the art. For a simple verification of the operation of the switching device, a series combination of a LED D2 and a resistor R9 is connected in parallel to the output.
A semiconductor switching element Q3 in parallel to the output and the series combination is present, a main electrode EQ3 of which element is connected to a main electrode EQ2 of a semiconductor switch Q2 which is connected between input and output. A control electrode GQ2 of semiconductor switch Q2 is connected to a control electrode GQ3 of the semiconductor switching element Q3 and to a shared control circuit.
The control electrodes GQ2 and GQ3 are connected to a center tap 2 of a potentiometer R10, which is connected in series with a transistor Q1. The position of the center tap 2 of the potentiometer R10 determines the degree of current conduction through the semiconductor switch Q2 and the semiconductor switching element Q3.
The series combination of potentiometer R10 and transistor Q1 constitutes an output of a pulse-width modulator formed around an opamp U2B. An output 7 of opamp U2B is connected to a base of transistor Q1. Input 5 of the opamp U2B is connected to a capacitor C5, which is part of an oscillator, and input 6 of opamp U2B is connected to a variable voltage divider R7, R6, R5. The time per cycle of the oscillator frequency during which the signal at output 7 turns transistor Q1 on or off respectively, can be varied by means of the variable voltage divider, so that the pulse width of the current pulse is varied by the semiconductor switch Q2.
Capacitor C5 and opamp U2A form part of an oscillation circuit in which the capacitor C5 together with impedances R4 and R12 constitutes a voltage divider circuit. R4 is herein an adjustable resistor, which achieves that the frequency generated by the oscillation circuit can be adjusted and can therefore be varied. In consequence, the current pulse frequency will vary accordingly.
In a practical realization, the opamps U2A and U2B are constituted by a single integrated circuit (IC) of the type TS393CN. Transistor Q1 is of the type BC548C, semiconductor switch Q2 of the type BC639, and semiconductor switching element Q3 of the type BC640. The oscillator circuit has a default frequency of 200 Hz. Potentiometer R10 has a strength of 4.7 kΩ and has a 100% control range. The switching device is intended to be connected to a 15V DC supply source. The switching device drives a LED array for road marking, which LED array comprises a total of 400 LEDs of the type Nichia NSPW300BS. In nominal condition the supply is effected such that the mean current flowing through each LED of the array is 20 mA. Brightness control down to a level corresponding to a mean current through each LED of 1 mA takes place exclusively by varying the voltage divider R7, R6, R5. The pulse width is then modulated to a 2% duty cycle. For further reduction of the brightness, the setting of the potentiometer R10 is varied. When the complete control range of the potentiometer R10 is utilized, the mean current flowing through each LED can be reduced to 1 μA.

Claims (2)

1. A switching device for driving an LED array, wherein the switching device comprises means for driving the LED array with a pulse-shaped current of mean strength and for regulating the mean strength of the pulse-shaped current flowing through the LED array by modulation means for modulating the pulse-shaped current with frequency modulation, pulse-width modulation, and amplitude modulation, wherein the mean strength has a nominal strength Inom and wherein, from Inom down to 0.05 Inom, the mean strength is regulated by means of the pulse-width modulation, and for less than 0.05 Inom, the mean strength is regulated by superimposing the pulse-width modulation on the amplitude modulation.
2. The switching device as claimed in claim 1, wherein for smaller than 0.05.10−3 Inom, the mean strength is regulated by the frequency modulation.
US10/504,139 2002-02-14 2003-02-06 Switching device for driving LED array by pulse-shaped current modulation Expired - Lifetime US7463070B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US12/265,354 US20090072761A1 (en) 2002-02-14 2008-11-05 Switching device for driving led array by pulse-shaped current modulation

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP020756276 2002-02-14
EP02075627 2002-02-14
PCT/IB2003/000418 WO2003069958A1 (en) 2002-02-14 2003-02-06 Switching device for driving a led array

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US12/265,354 Continuation US20090072761A1 (en) 2002-02-14 2008-11-05 Switching device for driving led array by pulse-shaped current modulation

Publications (2)

Publication Number Publication Date
US20050088209A1 US20050088209A1 (en) 2005-04-28
US7463070B2 true US7463070B2 (en) 2008-12-09

Family

ID=27675721

Family Applications (2)

Application Number Title Priority Date Filing Date
US10/504,139 Expired - Lifetime US7463070B2 (en) 2002-02-14 2003-02-06 Switching device for driving LED array by pulse-shaped current modulation
US12/265,354 Abandoned US20090072761A1 (en) 2002-02-14 2008-11-05 Switching device for driving led array by pulse-shaped current modulation

Family Applications After (1)

Application Number Title Priority Date Filing Date
US12/265,354 Abandoned US20090072761A1 (en) 2002-02-14 2008-11-05 Switching device for driving led array by pulse-shaped current modulation

Country Status (10)

Country Link
US (2) US7463070B2 (en)
EP (1) EP1479270B1 (en)
JP (1) JP4633363B2 (en)
KR (1) KR100960825B1 (en)
CN (1) CN100477868C (en)
AT (1) ATE332622T1 (en)
AU (1) AU2003201751A1 (en)
DE (1) DE60306624T2 (en)
TW (1) TWI279764B (en)
WO (1) WO2003069958A1 (en)

Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110080111A1 (en) * 2009-10-07 2011-04-07 Lutron Electronics Co., Inc. Configurable load control device for light-emitting diode light sources
US8070325B2 (en) 2006-04-24 2011-12-06 Integrated Illumination Systems LED light fixture
US8243278B2 (en) 2008-05-16 2012-08-14 Integrated Illumination Systems, Inc. Non-contact selection and control of lighting devices
US8278845B1 (en) 2011-07-26 2012-10-02 Hunter Industries, Inc. Systems and methods for providing power and data to lighting devices
US8436553B2 (en) 2007-01-26 2013-05-07 Integrated Illumination Systems, Inc. Tri-light
US20130154503A1 (en) * 2010-04-16 2013-06-20 Hella Kgaa Method to control a lighting current of a lighting device
US8469542B2 (en) 2004-05-18 2013-06-25 II Thomas L. Zampini Collimating and controlling light produced by light emitting diodes
US8567982B2 (en) 2006-11-17 2013-10-29 Integrated Illumination Systems, Inc. Systems and methods of using a lighting system to enhance brand recognition
US8585245B2 (en) 2009-04-23 2013-11-19 Integrated Illumination Systems, Inc. Systems and methods for sealing a lighting fixture
US8680787B2 (en) 2011-03-15 2014-03-25 Lutron Electronics Co., Inc. Load control device for a light-emitting diode light source
US8742686B2 (en) 2007-09-24 2014-06-03 Integrated Illumination Systems, Inc. Systems and methods for providing an OEM level networked lighting system
US8803437B2 (en) 2011-09-25 2014-08-12 Wen-Hsiung Hsieh Switching mode pulsed current supply for driving LEDS
US8810147B2 (en) 2012-07-15 2014-08-19 Wen-Hsiung Hsieh Method and circuit for driving LEDs with a pulsed current
US8894437B2 (en) 2012-07-19 2014-11-25 Integrated Illumination Systems, Inc. Systems and methods for connector enabling vertical removal
US9066381B2 (en) 2011-03-16 2015-06-23 Integrated Illumination Systems, Inc. System and method for low level dimming
US9379578B2 (en) 2012-11-19 2016-06-28 Integrated Illumination Systems, Inc. Systems and methods for multi-state power management
US9420665B2 (en) 2012-12-28 2016-08-16 Integration Illumination Systems, Inc. Systems and methods for continuous adjustment of reference signal to control chip
US9485814B2 (en) 2013-01-04 2016-11-01 Integrated Illumination Systems, Inc. Systems and methods for a hysteresis based driver using a LED as a voltage reference
US9521725B2 (en) 2011-07-26 2016-12-13 Hunter Industries, Inc. Systems and methods for providing power and data to lighting devices
US9609720B2 (en) 2011-07-26 2017-03-28 Hunter Industries, Inc. Systems and methods for providing power and data to lighting devices
US10030844B2 (en) 2015-05-29 2018-07-24 Integrated Illumination Systems, Inc. Systems, methods and apparatus for illumination using asymmetrical optics
US10060599B2 (en) 2015-05-29 2018-08-28 Integrated Illumination Systems, Inc. Systems, methods and apparatus for programmable light fixtures
US10159132B2 (en) 2011-07-26 2018-12-18 Hunter Industries, Inc. Lighting system color control
US10228711B2 (en) 2015-05-26 2019-03-12 Hunter Industries, Inc. Decoder systems and methods for irrigation control
US10801714B1 (en) 2019-10-03 2020-10-13 CarJamz, Inc. Lighting device
US10874003B2 (en) 2011-07-26 2020-12-22 Hunter Industries, Inc. Systems and methods for providing power and data to devices
US10918030B2 (en) 2015-05-26 2021-02-16 Hunter Industries, Inc. Decoder systems and methods for irrigation control
US11917740B2 (en) 2011-07-26 2024-02-27 Hunter Industries, Inc. Systems and methods for providing power and data to devices

Families Citing this family (58)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1653297B (en) 2002-05-08 2010-09-29 佛森技术公司 High efficiency solid-state light source and methods of use and manufacture
JP2004235498A (en) * 2003-01-31 2004-08-19 Anden Light emitting diode controller
DE102004010942B3 (en) * 2004-03-05 2005-10-13 Kwl-Lighting Gmbh Control device and control process for the control of luminaries features an electrical circuit that reduces the perception of the brightness change
WO2006031810A2 (en) 2004-09-10 2006-03-23 Color Kinetics Incorporated Power control methods and apparatus for variable loads
JP4306657B2 (en) * 2004-10-14 2009-08-05 ソニー株式会社 Light emitting element driving device and display device
US9281001B2 (en) * 2004-11-08 2016-03-08 Phoseon Technology, Inc. Methods and systems relating to light sources for use in industrial processes
DE602005004502T2 (en) * 2005-02-02 2009-01-29 Osram Gesellschaft mit beschränkter Haftung Method and arrangement for dimming light sources
KR100761780B1 (en) * 2005-03-10 2007-09-28 네오뷰코오롱 주식회사 Organic Light Emitting Diode driving method and device using peak current
EP1734793B1 (en) * 2005-06-14 2008-04-16 Novaled AG Method and device for operating an OLED device
DE502005004675D1 (en) 2005-12-21 2008-08-21 Novaled Ag Organic component
KR100691628B1 (en) * 2006-04-07 2007-03-12 삼성전기주식회사 Apparatus for driving led arrays
US7746300B2 (en) * 2006-05-05 2010-06-29 Linear Technology Corporation Circuit and methodology for supplying pulsed current to a load, such as a light emitting diode
DE102006032071B4 (en) * 2006-07-11 2008-07-10 Austriamicrosystems Ag Control circuit and method for controlling light emitting diodes
DE102007010039A1 (en) * 2007-03-01 2008-09-04 Osram Gesellschaft mit beschränkter Haftung Optoelectronic device for emission of electromagnetic radiation with controlled radiation intensity, has optoelectronic element which produces electromagnetic radiation during operation
DE102007052434A1 (en) * 2007-11-02 2009-05-07 Hella Kgaa Hueck & Co. Method for dimming a light-emitting diode arrangement of a motor vehicle
US8118447B2 (en) 2007-12-20 2012-02-21 Altair Engineering, Inc. LED lighting apparatus with swivel connection
US7712918B2 (en) 2007-12-21 2010-05-11 Altair Engineering , Inc. Light distribution using a light emitting diode assembly
DE102008008181A1 (en) * 2008-02-08 2009-08-13 Audi Ag Method for operating a motor vehicle lighting device
US8360599B2 (en) 2008-05-23 2013-01-29 Ilumisys, Inc. Electric shock resistant L.E.D. based light
US8994615B2 (en) 2008-06-06 2015-03-31 Dolby Laboratories Licensing Corporation Apparatus and methods for driving solid-state illumination sources
US7976196B2 (en) 2008-07-09 2011-07-12 Altair Engineering, Inc. Method of forming LED-based light and resulting LED-based light
US7946729B2 (en) 2008-07-31 2011-05-24 Altair Engineering, Inc. Fluorescent tube replacement having longitudinally oriented LEDs
US8674626B2 (en) 2008-09-02 2014-03-18 Ilumisys, Inc. LED lamp failure alerting system
US8256924B2 (en) 2008-09-15 2012-09-04 Ilumisys, Inc. LED-based light having rapidly oscillating LEDs
US8444292B2 (en) 2008-10-24 2013-05-21 Ilumisys, Inc. End cap substitute for LED-based tube replacement light
US8901823B2 (en) 2008-10-24 2014-12-02 Ilumisys, Inc. Light and light sensor
US8214084B2 (en) 2008-10-24 2012-07-03 Ilumisys, Inc. Integration of LED lighting with building controls
US8653984B2 (en) 2008-10-24 2014-02-18 Ilumisys, Inc. Integration of LED lighting control with emergency notification systems
US7938562B2 (en) 2008-10-24 2011-05-10 Altair Engineering, Inc. Lighting including integral communication apparatus
US8324817B2 (en) 2008-10-24 2012-12-04 Ilumisys, Inc. Light and light sensor
US8556452B2 (en) 2009-01-15 2013-10-15 Ilumisys, Inc. LED lens
US8362710B2 (en) 2009-01-21 2013-01-29 Ilumisys, Inc. Direct AC-to-DC converter for passive component minimization and universal operation of LED arrays
US8664880B2 (en) 2009-01-21 2014-03-04 Ilumisys, Inc. Ballast/line detection circuit for fluorescent replacement lamps
US8330381B2 (en) 2009-05-14 2012-12-11 Ilumisys, Inc. Electronic circuit for DC conversion of fluorescent lighting ballast
US8299695B2 (en) 2009-06-02 2012-10-30 Ilumisys, Inc. Screw-in LED bulb comprising a base having outwardly projecting nodes
EP2446715A4 (en) 2009-06-23 2013-09-11 Ilumisys Inc Illumination device including leds and a switching power control system
DE102009040283A1 (en) * 2009-09-04 2011-03-10 Tridonic Ag Operation of pulse modulated LEDs
CA2716022C (en) * 2010-09-30 2019-03-12 Light-Based Technologies Incorporated Apparatus and methods for supplying power
WO2011119907A2 (en) 2010-03-26 2011-09-29 Altair Engineering, Inc. Led light tube with dual sided light distribution
EP2553320A4 (en) 2010-03-26 2014-06-18 Ilumisys Inc Led light with thermoelectric generator
WO2011119958A1 (en) 2010-03-26 2011-09-29 Altair Engineering, Inc. Inside-out led bulb
US8454193B2 (en) 2010-07-08 2013-06-04 Ilumisys, Inc. Independent modules for LED fluorescent light tube replacement
US8596813B2 (en) 2010-07-12 2013-12-03 Ilumisys, Inc. Circuit board mount for LED light tube
CA2806052A1 (en) 2010-07-22 2012-01-26 Independence Led Lighting, Llc Light engine device with direct to linear system driver
EP2633227B1 (en) 2010-10-29 2018-08-29 iLumisys, Inc. Mechanisms for reducing risk of shock during installation of light tube
US8870415B2 (en) 2010-12-09 2014-10-28 Ilumisys, Inc. LED fluorescent tube replacement light with reduced shock hazard
US9967940B2 (en) 2011-05-05 2018-05-08 Integrated Illumination Systems, Inc. Systems and methods for active thermal management
US9072171B2 (en) 2011-08-24 2015-06-30 Ilumisys, Inc. Circuit board mount for LED light
US9184518B2 (en) 2012-03-02 2015-11-10 Ilumisys, Inc. Electrical connector header for an LED-based light
WO2014008463A1 (en) 2012-07-06 2014-01-09 Ilumisys, Inc. Power supply assembly for led-based light tube
US9271367B2 (en) 2012-07-09 2016-02-23 Ilumisys, Inc. System and method for controlling operation of an LED-based light
US9285084B2 (en) 2013-03-14 2016-03-15 Ilumisys, Inc. Diffusers for LED-based lights
DE102013105463B3 (en) * 2013-05-28 2014-11-06 Vossloh-Schwabe Deutschland Gmbh Operating device and method for operating a dimmable lamp arrangement
US9267650B2 (en) 2013-10-09 2016-02-23 Ilumisys, Inc. Lens for an LED-based light
US9574717B2 (en) 2014-01-22 2017-02-21 Ilumisys, Inc. LED-based light with addressed LEDs
US9510400B2 (en) 2014-05-13 2016-11-29 Ilumisys, Inc. User input systems for an LED-based light
DE202015102108U1 (en) * 2015-04-28 2016-08-01 Zumtobel Lighting Gmbh Operating device for operating at least one LED and arrangement for lighting with a control gear and at least one LED
US10161568B2 (en) 2015-06-01 2018-12-25 Ilumisys, Inc. LED-based light with canted outer walls

Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3998043A (en) * 1973-12-26 1976-12-21 Citizen Watch Co., Ltd. Electric timepiece for displaying the operating condition thereof
EP0553867A2 (en) 1992-01-30 1993-08-04 Fujitsu Limited Drive circuit for electronic device
EP0625843A1 (en) 1993-05-17 1994-11-23 Eastman Kodak Company A laser diode operated in hybrid modulation modes
US5736881A (en) * 1994-12-05 1998-04-07 Hughes Electronics Diode drive current source
DE19732828A1 (en) 1997-07-30 1999-02-04 Siemens Ag PWM address circuit for light-emitting diode array
WO1999056303A1 (en) 1997-01-10 1999-11-04 Hochstein Peter A Maintaining led luminous intensity
WO2000020691A1 (en) 1999-05-20 2000-04-13 Koninklijke Philips Electronics N.V. Road-marking complex and system for marking roads
US6333605B1 (en) * 1999-11-02 2001-12-25 Energy Savings, Inc. Light modulating electronic ballast
US6388398B1 (en) * 2001-03-20 2002-05-14 Koninklijke Philips Electronics N.V. Mixed mode control for ballast circuit
US20030085749A1 (en) * 2000-02-03 2003-05-08 Koninklijke Philips Electronics N.V. Supply assembly for a led lighting module
US6580309B2 (en) 2000-02-03 2003-06-17 Koninklijke Philips Electronics N.V. Supply assembly for a LED lighting module
US20030127995A1 (en) * 2002-01-10 2003-07-10 Koninklijke Philips Electronics N.V. High frequency electronic ballast
US6686703B2 (en) 2002-01-10 2004-02-03 Koninklijke Philips Electronics N.V. High frequency electronic ballast
US6836079B2 (en) * 2000-03-31 2004-12-28 Sam-Pyo Hong Light emitting lamp

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4313227A (en) * 1979-01-29 1982-01-26 Texas Instruments Incorporated Light energy information transmission system
US5671003A (en) * 1991-11-04 1997-09-23 Eastman Kodak Company Hybrid digital image printer with halftone gray scale capability
JPH0777424A (en) * 1993-09-07 1995-03-20 Wacom Co Ltd Optical surveying instrument
US7202613B2 (en) * 2001-05-30 2007-04-10 Color Kinetics Incorporated Controlled lighting methods and apparatus

Patent Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3998043A (en) * 1973-12-26 1976-12-21 Citizen Watch Co., Ltd. Electric timepiece for displaying the operating condition thereof
EP0553867A2 (en) 1992-01-30 1993-08-04 Fujitsu Limited Drive circuit for electronic device
EP0625843A1 (en) 1993-05-17 1994-11-23 Eastman Kodak Company A laser diode operated in hybrid modulation modes
US5736881A (en) * 1994-12-05 1998-04-07 Hughes Electronics Diode drive current source
WO1999056303A1 (en) 1997-01-10 1999-11-04 Hochstein Peter A Maintaining led luminous intensity
DE19732828A1 (en) 1997-07-30 1999-02-04 Siemens Ag PWM address circuit for light-emitting diode array
WO2000020691A1 (en) 1999-05-20 2000-04-13 Koninklijke Philips Electronics N.V. Road-marking complex and system for marking roads
US6333605B1 (en) * 1999-11-02 2001-12-25 Energy Savings, Inc. Light modulating electronic ballast
US20030085749A1 (en) * 2000-02-03 2003-05-08 Koninklijke Philips Electronics N.V. Supply assembly for a led lighting module
US6580309B2 (en) 2000-02-03 2003-06-17 Koninklijke Philips Electronics N.V. Supply assembly for a LED lighting module
US6836079B2 (en) * 2000-03-31 2004-12-28 Sam-Pyo Hong Light emitting lamp
US6388398B1 (en) * 2001-03-20 2002-05-14 Koninklijke Philips Electronics N.V. Mixed mode control for ballast circuit
US20030127995A1 (en) * 2002-01-10 2003-07-10 Koninklijke Philips Electronics N.V. High frequency electronic ballast
US6686703B2 (en) 2002-01-10 2004-02-03 Koninklijke Philips Electronics N.V. High frequency electronic ballast

Cited By (46)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8469542B2 (en) 2004-05-18 2013-06-25 II Thomas L. Zampini Collimating and controlling light produced by light emitting diodes
US8070325B2 (en) 2006-04-24 2011-12-06 Integrated Illumination Systems LED light fixture
US8567982B2 (en) 2006-11-17 2013-10-29 Integrated Illumination Systems, Inc. Systems and methods of using a lighting system to enhance brand recognition
US8436553B2 (en) 2007-01-26 2013-05-07 Integrated Illumination Systems, Inc. Tri-light
US8742686B2 (en) 2007-09-24 2014-06-03 Integrated Illumination Systems, Inc. Systems and methods for providing an OEM level networked lighting system
US8243278B2 (en) 2008-05-16 2012-08-14 Integrated Illumination Systems, Inc. Non-contact selection and control of lighting devices
US8255487B2 (en) 2008-05-16 2012-08-28 Integrated Illumination Systems, Inc. Systems and methods for communicating in a lighting network
US8264172B2 (en) 2008-05-16 2012-09-11 Integrated Illumination Systems, Inc. Cooperative communications with multiple master/slaves in a LED lighting network
US8585245B2 (en) 2009-04-23 2013-11-19 Integrated Illumination Systems, Inc. Systems and methods for sealing a lighting fixture
US8466628B2 (en) 2009-10-07 2013-06-18 Lutron Electronics Co., Inc. Closed-loop load control circuit having a wide output range
US8492987B2 (en) 2009-10-07 2013-07-23 Lutron Electronics Co., Inc. Load control device for a light-emitting diode light source
US8492988B2 (en) 2009-10-07 2013-07-23 Lutron Electronics Co., Inc. Configurable load control device for light-emitting diode light sources
US8810159B2 (en) 2009-10-07 2014-08-19 Lutron Electronics Co., Inc. System and method for programming a configurable load control device
US8664888B2 (en) 2009-10-07 2014-03-04 Lutron Electronics Co., Inc. Power converter for a configurable light-emitting diode driver
US9035563B2 (en) 2009-10-07 2015-05-19 Lutron Electronics Co., Inc. System and method for programming a configurable load control device
US20110080111A1 (en) * 2009-10-07 2011-04-07 Lutron Electronics Co., Inc. Configurable load control device for light-emitting diode light sources
US20110080110A1 (en) * 2009-10-07 2011-04-07 Lutron Electronics Co., Inc. Load control device for a light-emitting diode light source
US20130154503A1 (en) * 2010-04-16 2013-06-20 Hella Kgaa Method to control a lighting current of a lighting device
EP2559322B1 (en) * 2010-04-16 2016-08-24 Hella KGaA Hueck & Co. Method for controlling a light flux of a lighting device that has a plurality of semiconductor luminous elements and is designed for the identification and marking of traffic areas of airports
US8680787B2 (en) 2011-03-15 2014-03-25 Lutron Electronics Co., Inc. Load control device for a light-emitting diode light source
US9066381B2 (en) 2011-03-16 2015-06-23 Integrated Illumination Systems, Inc. System and method for low level dimming
US8710770B2 (en) 2011-07-26 2014-04-29 Hunter Industries, Inc. Systems and methods for providing power and data to lighting devices
US10159132B2 (en) 2011-07-26 2018-12-18 Hunter Industries, Inc. Lighting system color control
US11917740B2 (en) 2011-07-26 2024-02-27 Hunter Industries, Inc. Systems and methods for providing power and data to devices
US11503694B2 (en) 2011-07-26 2022-11-15 Hunter Industries, Inc. Systems and methods for providing power and data to devices
US8278845B1 (en) 2011-07-26 2012-10-02 Hunter Industries, Inc. Systems and methods for providing power and data to lighting devices
US10874003B2 (en) 2011-07-26 2020-12-22 Hunter Industries, Inc. Systems and methods for providing power and data to devices
US9521725B2 (en) 2011-07-26 2016-12-13 Hunter Industries, Inc. Systems and methods for providing power and data to lighting devices
US10375793B2 (en) 2011-07-26 2019-08-06 Hunter Industries, Inc. Systems and methods for providing power and data to devices
US9609720B2 (en) 2011-07-26 2017-03-28 Hunter Industries, Inc. Systems and methods for providing power and data to lighting devices
US8803437B2 (en) 2011-09-25 2014-08-12 Wen-Hsiung Hsieh Switching mode pulsed current supply for driving LEDS
US8810147B2 (en) 2012-07-15 2014-08-19 Wen-Hsiung Hsieh Method and circuit for driving LEDs with a pulsed current
US8894437B2 (en) 2012-07-19 2014-11-25 Integrated Illumination Systems, Inc. Systems and methods for connector enabling vertical removal
US9379578B2 (en) 2012-11-19 2016-06-28 Integrated Illumination Systems, Inc. Systems and methods for multi-state power management
US9578703B2 (en) 2012-12-28 2017-02-21 Integrated Illumination Systems, Inc. Systems and methods for continuous adjustment of reference signal to control chip
US9420665B2 (en) 2012-12-28 2016-08-16 Integration Illumination Systems, Inc. Systems and methods for continuous adjustment of reference signal to control chip
US9485814B2 (en) 2013-01-04 2016-11-01 Integrated Illumination Systems, Inc. Systems and methods for a hysteresis based driver using a LED as a voltage reference
US10918030B2 (en) 2015-05-26 2021-02-16 Hunter Industries, Inc. Decoder systems and methods for irrigation control
US11229168B2 (en) 2015-05-26 2022-01-25 Hunter Industries, Inc. Decoder systems and methods for irrigation control
US10228711B2 (en) 2015-05-26 2019-03-12 Hunter Industries, Inc. Decoder systems and methods for irrigation control
US11771024B2 (en) 2015-05-26 2023-10-03 Hunter Industries, Inc. Decoder systems and methods for irrigation control
US10584848B2 (en) 2015-05-29 2020-03-10 Integrated Illumination Systems, Inc. Systems, methods and apparatus for programmable light fixtures
US10060599B2 (en) 2015-05-29 2018-08-28 Integrated Illumination Systems, Inc. Systems, methods and apparatus for programmable light fixtures
US10030844B2 (en) 2015-05-29 2018-07-24 Integrated Illumination Systems, Inc. Systems, methods and apparatus for illumination using asymmetrical optics
US10801714B1 (en) 2019-10-03 2020-10-13 CarJamz, Inc. Lighting device
US11054127B2 (en) 2019-10-03 2021-07-06 CarJamz Com, Inc. Lighting device

Also Published As

Publication number Publication date
AU2003201751A1 (en) 2003-09-04
KR20040096566A (en) 2004-11-16
EP1479270B1 (en) 2006-07-05
WO2003069958A1 (en) 2003-08-21
ATE332622T1 (en) 2006-07-15
DE60306624D1 (en) 2006-08-17
JP4633363B2 (en) 2011-02-16
CN1633827A (en) 2005-06-29
EP1479270A1 (en) 2004-11-24
US20090072761A1 (en) 2009-03-19
DE60306624T2 (en) 2007-06-21
TWI279764B (en) 2007-04-21
CN100477868C (en) 2009-04-08
US20050088209A1 (en) 2005-04-28
JP2005518102A (en) 2005-06-16
KR100960825B1 (en) 2010-06-07
TW200303512A (en) 2003-09-01

Similar Documents

Publication Publication Date Title
US7463070B2 (en) Switching device for driving LED array by pulse-shaped current modulation
CN100583213C (en) LED driver circuit
US8339053B2 (en) LED dimming apparatus
JP4642355B2 (en) Light emitting diode driver
JP4588994B2 (en) Lighting device
US7496297B2 (en) LED system for illumination and data transmission
US7952297B2 (en) Driving device for providing light dimming control of light-emitting element
US9451673B2 (en) Device for controlling a lighting device
JP2004048011A (en) Power feeder circuit for light emitting diode array and liquid crystal display unit
JP2009527894A5 (en)
JP2009527894A (en) Circuit arrangement for modulating LED and method of operating LED
WO2016049671A1 (en) Switched direct ac driver for leds
EP3349319B1 (en) Method and apparatus for correcting for power harmonics
US11019702B2 (en) Driver and method for driving at least two sets of solid state lighting elements
US10531533B1 (en) Light-emitting diode lighting system with automatic bleeder current control
US20140145645A1 (en) Step-dimming led driver and system
WO2018073069A1 (en) A current modulation circuit, a driving circuit, and a method for driving a lighting load with current modulation
CN115176524A (en) LED lighting system and control method
KR20160115237A (en) Switching typed LED driving apparatus
US11785691B2 (en) Control circuits and methods for driving at least one LED group
WO1999014988A1 (en) Group dimming system for gas discharge lamps

Legal Events

Date Code Title Description
STCF Information on status: patent grant

Free format text: PATENTED CASE

FPAY Fee payment

Year of fee payment: 4

FPAY Fee payment

Year of fee payment: 8

AS Assignment

Owner name: KONINKLIJKE PHILIPS N.V., NETHERLANDS

Free format text: CHANGE OF NAME;ASSIGNOR:KONINKLIJKE PHILIPS ELECTRONICS N.V.;REEL/FRAME:039428/0606

Effective date: 20130515

AS Assignment

Owner name: PHILIPS LIGHTING HOLDING B.V., NETHERLANDS

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:KONINKLIJKE PHILIPS N.V.;REEL/FRAME:040060/0009

Effective date: 20160607

AS Assignment

Owner name: SIGNIFY HOLDING B.V., NETHERLANDS

Free format text: CHANGE OF NAME;ASSIGNOR:PHILIPS LIGHTING HOLDING B.V.;REEL/FRAME:050837/0576

Effective date: 20190201

MAFP Maintenance fee payment

Free format text: PAYMENT OF MAINTENANCE FEE, 12TH YEAR, LARGE ENTITY (ORIGINAL EVENT CODE: M1553); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

Year of fee payment: 12